Area code 202

202Area codes in Washington, D.C.
Area code 202 is the North American telephone area code for Washington, DC. The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).wikipedia
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List of original NANP area codes

original area codesoriginal 86 area codesoriginal area code
The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).

North American Numbering Plan

Area codeArea codesArea code(s)
The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).
The second area code, 202, was assigned to the District of Columbia.

Seven-digit dialing

7-digit dialing7-digit diallingfixed-length seven-digit number
Washington is thus one of the largest cities where seven-digit dialing is still possible.

Area codes 301 and 240

301240 & 301240
From the 1950s to 1990, area code 202 was an unpublished alternate area code for the nearby suburbs in Maryland and Virginia, which were officially in area codes 301 and 703, respectively.
From 1947 to 1990, the telephone numbering plan of the entire Washington metropolitan area, including Washington, D.C. (area code 202), and the large suburban areas in Maryland and Virginia (area code 703), operated in a system of central office code protection, meaning that no central office code in Washington D.C., and in the Maryland and Virginia suburbs could exist in more than a single central office.

Area codes 410, 443, and 667

410, 443, and 667410410 & 443
This did not free up enough numbers to meet demand on either side of the Potomac River, forcing the split of area code 410 from 301 in 1991 and the split of area code 540 from 703 in 1995.
Before these area codes were created, all of Maryland had been served by 301 since the institution of area codes in 1947, even though the state is home to two very large metropolitan areas—Baltimore and the Maryland suburbs of Washington, D.C. (area code 202).

Washington, D.C.

Washington, DCWashington D.C.District of Columbia
Area code 202 is the North American telephone area code for Washington, DC.

Area codes 703 and 571

703571571 & 703
From the 1950s to 1990, area code 202 was an unpublished alternate area code for the nearby suburbs in Maryland and Virginia, which were officially in area codes 301 and 703, respectively.
While the Washington metro area is split between three area codes–Maryland's 301, the District's 202, and 703–it was a single local calling area.

North America

NorthNorth AmericanNA
Area code 202 is the North American telephone area code for Washington, DC.

Telephone

phonetelephonesLocal Telephone Service
Area code 202 is the North American telephone area code for Washington, DC.

Telephone numbering plan

Area codeTelephone codearea codes
Area code 202 is the North American telephone area code for Washington, DC.

AT&T

AT&T Inc.Southwestern Bell CorporationAT&T Latin America
The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).

Area codes 201 and 551

201area code 201551
After the State of New Jersey with area code 201, the District of Columbia was the second Numbering Plan Area (NPA).

Overlay plan

overlayoverlaidoverlay area code
As of 2019, no immediate plans exist to overlay the 202 area code (a split would be impossible due to the fact it is a single rate center), as NANPA estimates the current supply of numbers is sufficient at least to the year 2022.

Maryland

MDState of MarylandMaryland, USA
From the 1950s to 1990, area code 202 was an unpublished alternate area code for the nearby suburbs in Maryland and Virginia, which were officially in area codes 301 and 703, respectively.

Virginia

Commonwealth of VirginiaVAState of Virginia
From the 1950s to 1990, area code 202 was an unpublished alternate area code for the nearby suburbs in Maryland and Virginia, which were officially in area codes 301 and 703, respectively.

Eastern Shore of Maryland

Eastern ShoreMaryland's Eastern ShoreMaryland Eastern Shore
One side effect was that a central office prefix could only be duplicated in jurisdictions a safe distance from the metropolitan area, such as the Eastern Shore of Maryland or southwestern Virginia.

Potomac River

PotomacSouth Branch Potomac RiverNorth Branch Potomac River
This did not free up enough numbers to meet demand on either side of the Potomac River, forcing the split of area code 410 from 301 in 1991 and the split of area code 540 from 703 in 1995.

Area code 540

540
This did not free up enough numbers to meet demand on either side of the Potomac River, forcing the split of area code 410 from 301 in 1991 and the split of area code 540 from 703 in 1995.

Mobile number portability

number portabilitycarry their original phone number with a new providerMNP
Years after the introduction of mobile number portability, many cell phone customers on the Virginia and Maryland sides of the metro have 202 numbers.

Alexandria, Virginia

AlexandriaAlexandria, VAAlexandria City
Areas such as Alexandria, Arlington, Fairfax, Falls Church, McLean and Tysons in Virginia (703/571) and Rockville, Gaithersburg, Upper Marlboro, Bethesda and Landover in Maryland (301/240) are a local call to Washington.

Arlington County, Virginia

Arlington, VirginiaArlingtonArlington County
Areas such as Alexandria, Arlington, Fairfax, Falls Church, McLean and Tysons in Virginia (703/571) and Rockville, Gaithersburg, Upper Marlboro, Bethesda and Landover in Maryland (301/240) are a local call to Washington.

Fairfax, Virginia

FairfaxFairfax, VAFairfax City
Areas such as Alexandria, Arlington, Fairfax, Falls Church, McLean and Tysons in Virginia (703/571) and Rockville, Gaithersburg, Upper Marlboro, Bethesda and Landover in Maryland (301/240) are a local call to Washington.

Falls Church, Virginia

Falls ChurchFalls Church, VAFalls Church City
Areas such as Alexandria, Arlington, Fairfax, Falls Church, McLean and Tysons in Virginia (703/571) and Rockville, Gaithersburg, Upper Marlboro, Bethesda and Landover in Maryland (301/240) are a local call to Washington.

McLean, Virginia

McLeanMcLean, VAMcLean Virginia
Areas such as Alexandria, Arlington, Fairfax, Falls Church, McLean and Tysons in Virginia (703/571) and Rockville, Gaithersburg, Upper Marlboro, Bethesda and Landover in Maryland (301/240) are a local call to Washington.